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SN75LVCP601: Maximum Eye Opening

Part Number: SN75LVCP601


Could You please help clarify the measurement points of Eye Openings. Section 6.9 (Page 10)

First Left Plot: The Eye opening (6Gbps) seems to be constant at around 0.6V irrespective of the input trace length  frpm 2 to 22 in. Is this measurement after Rx Equalization.

Second Plot: Is it after De- Emphasis : The maximum output Eyeopening seems to be 0.5V Diff.

Does that mean that the output of SN75LVCP601 will have max eye opening of 0.5V p-p Diff even if the input voltage has higher eye opening. 

Hypothetically-  if 1V eye opening is applied at the input- the output ill have only 0.5V eye opening.

Also the first plot has 0.6V eyeopening max- but second plot has 0.5V eyeopening max- Could You please let me know reason for this.

Thank You,